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The Grenade, Hand, Anti-Tank No. 74, or 'Sticky Bomb', was a crude and unconventional (yet also sort of ingenious) anti-tank weapon developed by Great Britain in WW2, after they took it in the ass at Dunkirk and realized they needed to ramp up arms production to fill many gaps in their armed forces' armories.
The premise is simple, you have an explosive charge on a stick (a glass sphere containing a thickened and stabilized nitroglycerin compound), around that explosive charge you had a sock soaked in a thick and sticky glue, protecting the sock until it was Go-Time, was a two-part metal shell, which you'd release by pulling a pin, then you run up to the tank, slam the bomb onto it the side of it so it sticks and the glass breaks, then pull the arming pin and let it go to release the arming lever, to then haul ass out of there. The gel-like explosive would when smacked onto the tank, make for a sort of concentrated penetrating effect when detonating, to punch through the armor plate.
In theory, this works pretty well, it would absolutely penetrate steel plating, but in practice, there's a few issues, such as the fact that it requires you to get RIGHT up to an enemy tank, or the fact that it would fail to stick properly to tanks with a lot of dirt and dust on them, instead falling on the ground, blowing up there, and doing little to any damage to the tank. It was also known that the sticky sock of the grenade had the risk of sticking to your uniform if not carefully handled, and that's REALLY not good times. Naturally also, the handle of the sticky bomb would go careening at an incredible speed from the explosion, so better hope you're not in its path.
It *could* be thrown, but it was a heavy grenade, so it was difficult to throw very far, if you could throw it so it lands on top of the tank (where the armor would be thinner), that would be effective, but overall this would have been a difficult weapon to put to use outside of ambush scenarios and urban combat.